Method private since the return value is a private interface.

Remove unused import.

Remove unused lvar.

Add a shared ConcurrentMap for the RoutingAppender's start script and
the Routes route choosing script.

Better test fixture.

Better test fixture.

@SuppressWarnings("hiding").

nit.

unused imports (forgot).

status logger static with subclasses instead of each subclass defining
its own reference.

status logger static with subclasses instead of each subclass defining
its own reference.

LOG4J2-1051 suppress the stack trace for well-known lookups regardless of which Interpolator constructor is used

LOG4J2-1582 When initializing on platforms where JMX is not available, Interpolator component should not print stack trace for warning messages.

example.

examples.

in a Routes element. 

to use a plain logger instead of EventLogger.

LOG4J2-1582 When initializing on platforms where JMX is not available, Interpolator component should not print stack trace for warning messages.

supported. Clean up resources.

supported. Apply patch to URLStreamHandlerFactoryRule, just a comment.

implementation of the simplest case: initialize the default route from a
script run at appender start time.